X Expression

using System;
using System.Collections.Generic;
class XExpression
{
    static void Main()
    {
        string expression = Console.ReadLine();
        double numbersAdd = 0;
        List<double> numbers = new List<double>();
        List<double> numbersInBracket = new List<double>();
        List<char> sign = new List<char>();
        List<char> signInBracket = new List<char>();
        List<int> brackets = new List<int>();
        double sumToBrackets = 0;
        double sumInBrackets = 0;
        int brackeCounter = 0;

        for (int i = 0, p = 0; i < expression.Length; i++, p++)
            {
                numbersAdd = (int)Char.GetNumericValue(expression[i]);
                if (numbersAdd == -1)
                {
                    numbersAdd = (int)expression[i];
                    if (numbersAdd == 42)
                    {
                        sign.Add((char)numbersAdd);
                    }
                    if (numbersAdd == 47)
                    {
                        sign.Add((char)numbersAdd);
                    }
                    if (numbersAdd == 43)
                    {
                        sign.Add((char)numbersAdd);
                    }
                    if (numbersAdd == 45)
                    {
                        sign.Add((char)numbersAdd);
                    }
                    if (numbersAdd == 40 || numbersAdd == 41)
                    {
                        sign.Add((char)numbersAdd);
                        brackets.Add(i);
                        brackeCounter++;
                        int v = 0;
                        for (int i = expression[brackets[v]]; i < expression[brackets[v+1]]; i++, v++)
                        {
                            numbersAdd = (int)Char.GetNumericValue(expression[p + 1]);

                            if (numbersAdd == -1)
                            {
                                numbersAdd = (int)expression[p];
                                if (numbersAdd == 42)
                                {
                                    signInBracket.Add((char)numbersAdd);
                                }
                                if (numbersAdd == 47)
                                {
                                    signInBracket.Add((char)numbersAdd);
                                }
                                if (numbersAdd == 43)
                                {
                                    signInBracket.Add((char)numbersAdd);
                                }
                                if (numbersAdd == 45)
                                {
                                    signInBracket.Add((char)numbersAdd);
                                }

                                else
                                {
                                    numbersInBracket.Add(numbersAdd);
                                }

                            }
                        }

                    }
                }

                else
                {
                    numbers.Add(numbersAdd);
                }
            }

        int helper = 0;

        for (int i = 0, p = 0; i < (sign.Count - 1) - brackeCounter; i++, p++)
        {
            if (sign[p] != '(' && sign[p] != ')')
            {
                if (sign[p] == '*' && helper == 0)
                {
                    sumToBrackets += (numbers[p] * numbers[p + 1]);
                }
                if (sign[p] == '/' && helper == 0)
                {
                    sumToBrackets += (numbers[p] / numbers[p + 1]);
                }
                if (sign[p] == '-' && helper == 0)
                {
                    sumToBrackets += (numbers[p] - numbers[p + 1]);
                }
                if (sign[p] == '+' && helper == 0)
                {
                    sumToBrackets += (numbers[p] + numbers[p + 1]);
                }
                helper = 1;

            }

            if (helper == 1)
            {
                if (sign[p+1] == '*')
                {
                    sumToBrackets *= numbers[p + 2];
                }
                if (sign[p+1] == '/')
                {
                    sumToBrackets /= numbers[p + 2];
                }
                if (sign[p+1] == '-')
                {
                    sumToBrackets -= numbers[p + 2];
                }
                if (sign[p+1] == '+')
                {
                    sumToBrackets += numbers[p + 2];
                }
            }
        }

        Console.WriteLine("{0:F2}", sumToBrackets);
    }
 }